A couple of months ago, in a secretly recorded speech, prominent Republican media strategist Frank Luntz said this:

Marco Rubio’s getting his ass kicked…He’s getting destroyed by Mark Levin, by Rush Limbaugh, and a few others. He’s trying to find a legitimate, long-term effective solution to immigration that isn’t the traditional Republican approach, and talk radio is killing him.

Luntz’s† assessment of the situation bespoke one of the main problems faced by Rubio, the freshman GOP senator from Florida, if he’s going to be a contender for his party’s presidential nomination in 2016: He came to the Senate as a ...